Biotechnology is the use of to improve products and processes.
a. organisms
b. chemicals
c. computers
d. all of the above

All of the above

Biotechnology is the application of biology to technology. This technique combines the two disciplines together to formulate a better integrative system of functioning mechanisms for further medicine and other purposes. 
Cloning is a type of biotechnology wherein a specific subject or living subject is copied at the same DNA level -morphology, physiology and organismic whole hence, identically similar with one another when two subject are produced. 

He should put sand around the spill in order to contain it so that it won't spread

Although i don't know what is the simulated system, starfish are predators that eat mostly  microalgae,  snails, sponges, bivalves, mussels and other small marine animals. removing starfish from any system would definitely increase this animals that they prey.